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H. o. SERGEANT. TRIPOD SUPPORT FOR ROCK DRILLS.

No. 316,666. Patented Apr. 28, 1885.

arn'r HENRY C. SERGEAN'I, OF NEW YORK, N. Y.

TRlPOD-SUPPORTFOR ROCK-DRILLS.

SPECIFICATION forming part of Letters Patent No. 316,666,dated April 28, 1885.

Application filed November 6, 1884. (NoinodeL) To all whom it may concern:

Be it known that l, HENRY C. SERGEANT, of the city and county of New York, in the State of New York, have invented anew andprising a body or clamp in which the drill-back is held,hip-pieces on opposite sides of and supporting said body or clamp, legs extending one from each hip-piece, and a back leg or brace common to both hip-pieces and pivoted between them, so as to provide for setting the legs at various angles desired. The body or clamp is pivotally connected with the hip-pieces, so that it may be turned relatively thereto to pre sent the drill at different angles.

An important object of my invention is to provide a tripod-support in which the several parts are connected in a manner to secure all necessary adjustments, and which is composed of few parts and simple in construction.

The invention consists in novel features of construction and combinations of parts hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure l is a front elevation of a tripod embodying my invention. Fig. 2 is a side elevation thereof. Fig. 3 is a plan thereof. Fig. 4 is a horizontal section of the clamp or holder for the drill-cylinder, and portions of the hip-pieces wherein it is secured, on the plane of the dotted line so so, Fig. 1. Fig. 5 is a sectional view of the upper joint of one leg and the'hip-piece to which it is pivoted, on the plane of the dotted line 3 Fig. 2. Fig. 6 is an elevation of a weight and a portion of one of the legs in the relative position they occupy when placing the weight in position on the leg, and Fig. 7 is avertical section of a weight and leg.

Similar letters ofreference designate corresponding parts in all the figures.

The holder or clamp for holding the drillback consists of a collar or clamp, A, divided or split at a, and provided with ears or lugs a, through which is inserted a bolt, a for contracting the collar or clamp A in a well-understood manner. The collar or clamp Ais ribbed externally to give it the necessary strength, and

is adapted to receive and securely hold a wrist or circular hub on the drill-back. When the drill-back (not here shown) is to be secured in the clamp, its hub or circular projection is slipped into the clamp, and there secured by tightening the clamping-bolt a 13 B designate the two hips or hip-pieces of the tripod. These are made right and left, and are similar in appearance and construction. In the inner side of each hip or hip-piece B, near the larger end thereof, is a conical seat or bearing, b, and on opposite sides of the split collar or clamp A are trunnions 0, having taper or conical ends which fit the conical seats or bearings 12. Through each trunnion 0 extends a bolt, (1, having at the inner end a head, which is received in a socket or countersink, on the inside of the split collar A, and thereby holds the bolt against turning. Each bolt d is provided outside the hippiece with a nut, d, and by tightening the nuts (1 the collar or clamp A may be held tightly against movement relatively to the hippieces, while by loosening said nuts the turning of the clamp or collar on its trunnions c is provided for.

O O designate the two front legs, and O designates the back leg arranged between and pivoted to the rear portion of the hip-pieces B. At the upper end of the back leg, 0, is a head portion or horizontal socket or sleeve, 0*, having conical ends, which enter conical or taper seats or bearings e in the inner sides of the hips, and are there held by abolt, c, which passes through the horizontal sleeve and hips, and is provided with nuts. By tightening up the nuts on the bolt 0 the conical ends of the sleeve 0* will be tightly clamped into the conical seats or bearings c, and the swinging of the back leg will be prevented, while by loosening said nuts such swinging or adjustment will be permitted.

In the front end of each hip-piece B,and at a point below the center of the trunnions c of the clamp A,is a conical seat or bearing, 6, and on the upper end of each front leg 0 is a transverse eye or socket piece, 0*, having at the end a conical or taper projection or trunnion, e, fitting the seat or bearing e, as best shown in Figs. 5 and 2. In each hip,and at right angles to the bolt 61 therein,is a bolt, f, which passes through the seat or bearing 6, and on which oient width throughout to receive the round 50 the transverse'socket or eye at the head of each front leg is pivoted. One of these bolts f is clearly shown in Fig. 5. At the front end thereof is a nut, and by screwing up the nut the conical projection or trunnion 6 will be crowded into and tightly held against turning in its seat 6.

From the above description it will be clear that the inclination of the legs may be varied by swinging the adjustable back leg in a plane parallel with and between the hip-pieces, and that theclamp or holder A may be swung on its trunnions to vary the inclination of the drill, and clamped in place after adjustment by tightening the nuts 01 of the bolts d.

Owing to the two adjustments above referred to it is wholly unnecessary to have the front legs, O 0, swing in planes parallel with the hip-pieces B forward and backward. It

7 is very desirable, however, that provision be afforded for the swinging of the front legs in planes transverse to the hip-pieces or parallel with the plane in which are the trunnions a of the clamp or collar A. Such provision is afforded by the turning of the heads or sockets G of the front legs 0 on the bolts f, as .before described.

Both legs 0 O of the tripod may have or be adjusted'to an outward inclination divergent from each other, as shown by full lines'in Fig. 1, or either leg may be swung inward, so as to stand in a nearly vertical plane with a forward inclination only, as shown by dotted lines in Fig. 1. Such adjustment of the front legs as is indicated by the dotted lines in Fig. 1 is very advantageous, as it provides for bringing the drill to act close or near to the sidewalls in tunneling, building sewers, and otheranalogous work.

By my invention I provide a tripod-support which has but few parts, and is of simple construction, and which withal has provision for all necessary adjustments.

D designates the weights, one of which is applied to each leg. On each leg O O O is a portion, 9, which is forged square. Each weight Dis slotted or recessed from one side inward, as shown at h, the slot or recess being of sufiipart of the leg, and having between the ends of the Weight D an enlarged portion, it, made sufficiently wide and high to admit the square 9 on the leg, as shown in Fig. 6. Inside the weight the enlargement h is carried upward slightly, as shown in Fig. 7, thereby forming shoulders or guards 2'. (Shown in Figs. 6and 7.) In the sides of theweights are cavities j, which form handles for lifting them.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The combination,with the hip-pieces and front and back legs of a tripod-support, of a split collar or clampconstituting a holder for a drill-back, and provided with trunnions which are journaled in the said hip-pieces, a bolt and nut for tightening the split collar or clamp, and bolts independent of the tightening-bolt for securing said trunnionsto the hippieces, substantially as herein described.

2. The combination, with the hip-pieces B B, having conical seats b, of the split collar or clamp A, having conical trunnions c, a

tightening-bolt, a for contracting the collar or clamp A, and the tightening-bolts d with their nuts (1, for securing the trunnions in the hip-pieces, all substantially as herein described. i

3. The combination, with the hip-piecesB B, having conical seats 12 and c, of the split collar or clamp A, having conical trunnions c, the bolt a for contracting the collar or clamp A, the back leg, 0, and its head 0*, having conical ends fitting the seats 0, and the tighteningbolts d 0", substantially as herein described.

4. The combination, with the hip-pieces B B, provided in their inner sides with seats b and in their front ends with seats 6, of the split clamp or collar A, provided with trunnions c, and tightening-bolts d, the legs O each having a trunnion, e, fitting the seat e in a hip-piece, and tightening-boltsf, all substantially as herein described.

- H. O. SERGEANT.

Witnesses:

FREDK. HAYNES, O. E. MCDONALD. 

